Fix window focus issue, only render windows from the current desktop

kwin/src/cubeeffect.cpp

@@ -155,6 +155,12 @@ void CubeEffect::activate()
     }
 
     setRunning(true);
+
+    // QuickSceneEffect grabs the keyboard and mouse input, which pulls focus away from the active window
+    // and doesn't allow for interaction with anything on the desktop. These two calls fix that.
+    // TODO - move away from QuickSceneEffect
+    effects->ungrabKeyboard();
+    effects->stopMouseInterception(this);
 }
 
 void CubeEffect::deactivate()

kwin/src/qml/DesktopView.qml

@@ -15,6 +15,7 @@ Item {
     Repeater {
         model: KWinComponents.WindowFilterModel {
             activity: KWinComponents.Workspace.currentActivity
+            desktop: KWinComponents.Workspace.currentDesktop
             screenName: desktopView.screen.name
             windowModel: KWinComponents.WindowModel {}
         }

kwin/src/qml/main.qml

@@ -12,7 +12,7 @@ import org.kde.kwin.effect.cube
 Item {
     id: root
     antialiasing: true
-    focus: true
+    focus: false
 
     required property QtObject effect
     required property QtObject targetScreen